U.S. History Textbook Online:

Giude:  https://assets.openstax.org/oscms-prodcms/media/documents/student_getting_started_guide.pdf?_gl=1*1c87nbm*_gcl_au*NTQ5Nzk5Mzk3LjE3NTYzMzEzNTMuMTUyODg3MTkwLjE3NTYzMzEzNzAuMTc1NjMzMTQxOA..*_ga*MTAwNDAxODQxMC4xNzU2MzMxMzMy*_ga_T746F8B0QC*czE3NTYzMzEzMzEkbzEkZzEkdDE3NTYzMzE1MDEkajI1JGwwJGgw

Textbook: https://openstax.org/books/us-history/pages/1-introduction